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Old 12-05-2001, 11:26 AM   #1
2k2
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Question Which Synthetic to use?

Hey everyone, I am doing my first oil change on my WRX and its my first one doing myself (only 3k miles).

I know I want to put a synthetic brand in but I dont know a thing about what _w_ (ex: 0w40, 10w30). I live in pittsburgh pa and it can get pretty cold here, down to about 10 degrees or colder if its a bad winter.

I was planning on changing it today so if I could get any help on what oil to go buy. I was thinking of using Mobil one as well.

Last, do I have to buy an oil filter from subaru or would they sell them at a store like advance auto parts?

Thanks

Bryan
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Old 12-05-2001, 12:09 PM   #2
Richard L.
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Mobil 1 10w-30 seems to be a popular choice. You can even use 5w-30 since it flows better at start-up during cold weather. Check out this link for more info.

I personally like the OEM Subaru oil filter (made by Purolator). Plus, if you use Subaru oil filter, then you won't get a lecture from the service department if you need to take your car in for service.

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Old 12-05-2001, 05:24 PM   #3
GOT_WRX
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I put Mobile 1 10w30 and it is really good. I could feel the difference right away for real.

It runs more smoothly and especially at very low rpm, the car doesn't bog anymore.

I put in the oil for the 7500 mile oil change, installed fumoto valve, and used OEM filter (with gasket). No leaking, runs fine.

Definitely I'd recommend this oil.
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Old 12-06-2001, 01:49 AM   #4
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If not too late I'd hold off on going synthetic. Most people recommend waiting until about 10k miles to switch. It may be total hooey, but then again maybe not.

Chalk up another vote for Mobil 1 10w30, and the Purolator PureOne PL14460 filter, the 2.0 might use a different filter, but I doubt it. The PureOne is a crazy metallic blue. Way cool filter.
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Old 12-13-2001, 12:02 AM   #5
chileewili
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my choice is Amsoil all the way with a oem filter. do a search for mobil 1, there's been some long discussions about this subject.
also, check out amsoil.com and see some of the tests they did, perhaps it will keep you from going to the dark side (mobil1. hehe).
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Old 12-18-2001, 08:43 PM   #6
javalee
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Default Re: Which Synthetic to use?

Amsoil 0-30
its expensive.. but great product
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Old 12-19-2001, 09:09 AM   #7
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I have easy access to any Motul product, so if SWRT uses it I guess I will too! I'll be putting in Motul RBF 600 brake fluid this weekend, and my next oil change (just changed 500 mi. ago) will most likely be a switch to Motul. I always use the OEM filters and replace the crush washer with every change too.
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Old 12-20-2001, 03:27 PM   #8
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I've got different grades of Amsoil running in my different Subarus.

daily driver: 5w-30 xl-7500 stock filter. Switching to Amsoil soon - has run 0w-30 for over a year.
WRX : 5w-30. Amsoil SDF-20 filter.
legacy #2: 5w-30. Amsoil SDF-20 filter.
legacy #3: 10w-30. Amsoil SDF-20 filter.

Roger
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Old 12-20-2001, 09:27 PM   #9
Usacjudge
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I use Mobile 1 5w30 right now, it gets cold in Iowa
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Old 12-30-2001, 04:03 PM   #10
mturmel
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Default Motul...

I'll be putting in Motul 10w40 in my next oil change... I also have the RBF 600 brake fluid, good stuff!

Matt
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Old 12-30-2001, 10:26 PM   #11
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I use Castrol Syntec 5w50 and have had no problems with it winter or summer. I usually change at 5K miles.
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Old 12-30-2001, 10:51 PM   #12
Richard L.
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Here is an interesting reading about Castrol Syntec:

http://www.pecuniary.com/newsletters...csdefined.html
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Old 01-01-2002, 09:28 PM   #13
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Default Mobil 1 all the way

Yeah, I know that it is too late for input, but the line was just screaming for me. I use Mobil 1 5w-30 in my car. I change it anywhere between 6000 and 7500 and it works great. Living in Wisconsin, the 5w-30 lets the engine start really easy and the mileage doesn't suffer too much. (Unless it is really friggin' cold, like the 3 degrees it is outside right now!!!)
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Old 01-02-2002, 11:11 AM   #14
vvk
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Default Castrol Syntec

Quote:
Originally posted by AutoXr
I use Castrol Syntec 5w50 and have had no problems with it winter or summer. I usually change at 5K miles.
Get back to us when you have 300k miles on your car.

I tried Castrol Syntec 5W-50 once and I am sorry I did. I had a lot of valvetrain noise on cold mornings. If you look at the specs, you'll realize that Castrol Syntec 5W-50 flows more like 20W-50 oil in low temperatures. Hydrolic cam followers starve for oil during warm up in cold weather. Lots of valvetrain noise and probably lots of wear. That aside, everybody knows that Castrol Syntec is not really synthetic at all. It costs as much as Mobil 1 but it's not synthetic.

I am sticking with what Subaru recommends from now on -- 5W-30. My engine sounds a lot healthier. I use Mobil 1 all the time.

I really don't get why people use 10W-30 in their EJ25s when Subaru clearly recommends 5W-30 as the preferred weight. I use 10W-30 in my EJ18 because that's what Subaru recommends for that engine.
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Old 01-02-2002, 04:29 PM   #15
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Quote:
I really don't get why people use 10W-30 in their EJ25s when Subaru clearly recommends 5W-30 as the preferred weight.
Because it's what most stores carry. Some of the places I get my oil at have various viscosities of Mobil 1, but others only carry 1 choice. Besides. 5W-30 is "preferred" for temps ranging from 100 to below -20. 10W-30 and 10W-40 are the recommended weights for temps ranging from -5 to 100+. Severe duty usage vehicles are supposed to use 30, 40, 10W-50, 20W-40, or 20W-50. I figure my driving is closer to that of severe duty when compared to my grandmother (who the book is written for), so I should be using a bit more durable oil. From everything I've gathered about oil, the wider the viscosity spread, the more crap is in the oil, making it less durable.

If I were in a location that frequently dipped below 0, I'd run the thinnest oil I could find during winter, but the fact remains that Seattle doesn't see below 32 very often. It also doesn't get above 100 often at all, but that goes back to the viscosity additives.
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Old 01-02-2002, 08:59 PM   #16
mlambert
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is normal Mobil oil the same as Mobil 1 ?

i just got 4 quarts of mobil 10w30...come to think of it, I didnt even check the capacity. I hope it doesnt take more than 4 quarts!
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Old 01-02-2002, 09:56 PM   #17
mturmel
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Default Capacity...

Well,
The WRX needs 4.5 liters or 4.75 quarts, bummer!! Motul sells its oil in 2 liter cans only...

Matt
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Old 01-03-2002, 02:48 AM   #18
CosmoTheCat
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Mobil = dino oil ~$1/quart
Mobil 1 = synthetic ~$5/quart
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Old 01-03-2002, 01:40 PM   #19
Richard L.
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If you switch to Mobil 1 synthetic motor oil, you may experience louder valvetrain noise. Here is a reason why:

Mobil 1 SAE 5w-30:
Viscosity, cSt @ 40C: 53.0
Viscosity, cSt @ 100C: 9.9
Viscosity Index: 162

Pennzoil Synthetic with Pennzane SAE 5w-30:
Viscosity, cSt @ 40C: 57.4
Viscosity, cSt @ 100C: 9.87
Viscosity Index: 159

Quaker State Full Synthetic SAE 5w-30:
Viscosity, cSt @ 40C: 62.05
Viscosity, cSt @ 100C: 10.17
Viscosity Index: 151

Royal Purple SAE 5w-30:
Viscosity, cSt @ 40C: 62.5
Viscosity, cSt @ 100C: 10.5
Viscosity Index: 160

Redline SAE 5w-30:
Viscosity, cSt @ 40C: 65.0
Viscosity, cSt @ 100C: 10.6
Viscosity Index: 153

AMSOIL SAE 5w-30:
Viscosity, cSt @ 40C: 63.4
Viscosity, cSt @ 100C: 11.7
Viscosity Index: 182


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Edit: added Redline 5w-30

Last edited by Richard L.; 01-09-2002 at 01:24 PM.
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Old 01-06-2002, 11:40 AM   #20
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Default Re: Capacity...

Quote:
Originally posted by mturmel
Well,
The WRX needs 4.5 liters or 4.75 quarts, bummer!! Motul sells its oil in 2 liter cans only...

Matt
Unless they are different from there motorcycle packaging, I don't see why you can't find motul in quarts. It what I use in both of my street bikes.
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Old 01-08-2002, 11:51 PM   #21
SQUAD_907
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Question

where can i pick up amsoil oil?
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Old 01-09-2002, 12:33 PM   #22
tofu86
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you can get it from www.amsoil.com at the online store. I think you need a dealer number which I know a lot of people on bimmer.org or bimmerforums.com have.
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Old 01-09-2002, 01:19 PM   #23
Richard L.
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You don't need a dealer number in order to buy AMSOIL synthetic oil from their online store.

I recently switched to AMSOIL 5w-30 at 30K miles, and my RS is running extremely smooth and quiet. No leaks.

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Old 01-09-2002, 03:18 PM   #24
mturmel
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Default SI system...

Tex-WReX2,

We use the SI system up here, remember? So does Japan (Subaru...) and France (Motul...). I could not find a *cough* quart of Motul anywhere, only 2 liter can. Where did you get yours??

Matt
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Old 01-09-2002, 04:44 PM   #25
Tex-WReX2
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Default hmmmmmmmm

Let me check. I picked up the oil from a local moto shop. Maybe it is repackaged in the states? I have never tried to order it for any of my vehicles.

J
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